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Vol. 15 (2023)

Electrochemical Carbon Dioxide Reduction to Ethylene: From Mechanistic Understanding to Catalyst Surface Engineering

https://doi.org/10.1007/s40820-023-01146-x
Junpeng Qu
Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Xianjun Cao
Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Li Gao
Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Jiayi Li
Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Lu Li
Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Yuhan Xie
Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia
Yufei Zhao
Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Jinqiang Zhang
Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia
Minghong Wu
Joint International Laboratory on Environmental and Energy Frontier Materials, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, People’s Republic of China
Hao Liu
Centre for Clean Energy Technology, Faculty of Science, University of Technology Sydney, Broadway, Sydney, NSW 2007, Australia

Corresponding Author: Hao Liu

hao.liu@uts.edu.au

Nano-Micro Letters, Vol. 15 (2023), Article Number: 178

Abstract

Electrochemical carbon dioxide reduction reaction (CO2RR) provides a promising way to convert CO2 to chemicals. The multicarbon (C2+) products, especially ethylene, are of great interest due to their versatile industrial applications. However, selectively reducing CO2 to ethylene is still challenging as the additional energy required for the C–C coupling step results in large overpotential and many competing products. Nonetheless, mechanistic understanding of the key steps and preferred reaction pathways/conditions, as well as rational design of novel catalysts for ethylene production have been regarded as promising approaches to achieving the highly efficient and selective CO2RR. In this review, we first illustrate the key steps for CO2RR to ethylene (e.g., CO2 adsorption/activation, formation of *CO intermediate, C–C coupling step), offering mechanistic understanding of CO2RR conversion to ethylene. Then the alternative reaction pathways and conditions for the formation of ethylene and competitive products (C1 and other C2+ products) are investigated, guiding the further design and development of preferred conditions for ethylene generation. Engineering strategies of Cu-based catalysts for CO2RR-ethylene are further summarized, and the correlations of reaction mechanism/pathways, engineering strategies and selectivity are elaborated. Finally, major challenges and perspectives in the research area of CO2RR are proposed for future development and practical applications.


Highlights:
1 Three key processes in carbon dioxide reduction reaction (CO2RR) for ethylene generation were discussed, including CO2 adsorption/activation, *CO intermediates formation, and C-C coupling.
2 The preferable mechanism for ethylene over C1 and other C2 products reaction pathways.
3 Engineering strategies of Cu-based catalysts for CO2RR-ethylene.

Keywords

Key steps in CO2RR-ethylene Preferable reaction pathways Mechanism understanding Surface engineering strategies of Cu-based catalysts
Qu, Junpeng, Xianjun Cao, Li Gao, Jiayi Li, Lu Li, Yuhan Xie, Yufei Zhao, Jinqiang Zhang, Minghong Wu, and Hao Liu. 2023. “Electrochemical Carbon Dioxide Reduction to Ethylene: From Mechanistic Understanding to Catalyst Surface Engineering”. Nano-Micro Letters 15 (July):178. https://doi.org/10.1007/s40820-023-01146-x.
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